Xtrfy A1 Enhancement Kit can enhance mechanical keyboards. The kit contains a total of 120 black O-rings, which can be mounted on the back of each key, which makes the keys much quieter.The Features of Xtrfy A1 Enhancement Kit at a Glance:Black, noise dampening O-rings5 x spare white keycapsBrush for quick and efficient cleaningA keycap puller for all your customising needsMechanical Keyboard MaintenanceTo disassemble the key caps, the set also includes a practical key-button remover, which makes the keycaps very easy to remove. Five white key caps also allow the user to customise their keyboard and look particularly good in combination with LED lighting. Extra cleanliness is provided by the enclosed brush, which means that the insides of the keys can be cleaned quickly and effectively.Xtrfy A1 Enhancement Kit Specifications:O-Ring120 piecesBlackKeycaps5 keycapsWhiteCleaningBrushKeycap PullerOne